Log-dog.



PATENTED FEB. 18, 1906.

0. W. WILLETT.

LOG DOG.

APPLICATION FILED AUG.14, 1905.

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nal opening in its CHARLES W. VVILLETT, OF PORTLAND, OREGON.

LOG-DOG.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed August 14, 1906. Serial No. 274,156.

To all wltont it may concern:

Be it known that 1, CHARLES W. WILLETT, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented a new and useful Improvement in Log-Dogs, of which the following is a specification, reference being had to the drawings which form a part thereof.

My invention relates to improvements in the construction and means for operating a log-dog.

The object of my invention is to provide a log-dog having an automatic locking and releasing attachment ofthe lever and means to prevent slack or vibratory lateral movement of the lever and bars, also unnecessary backward movement of the lever and bar. These objects, as will hereinafter be seen, are accomplished by the novel and useful device which I have discovered. I attain these objccts and other practical advantages by the mechanism, construction, combination, and arrangement of parts illustrated. in the accompanying drawings, which form a part of this specification, and in which Figure 1 is a side elevation of my device adapted to a sliding knee mounted on a suitable sawmill-carriage and also shows in dotted lines a portion of a log in position. Fig. 2 is a perspective view of a stop-hook for the dog. Fig. 3 is a part-sectional end elevation showing the several parts of the device. Fig. 4 is an enlarged view of the side of the knuckle and quadrant, showing details of parts. Fig. 5 is a perspective view of the knuckle.

' Like numerals and letters refer to like parts throughout the views.

The construction of my device is as follows: The sliding knee A is mounted upon a suitable carriage. The knuckle B is pivoted at its lower end to the knee near its center by means of the pivot-pin 6, formed to fit the eye 7. The knuckle B is provided with the lower and upper sockets or pairs of jaws 8 and 12, Fig. 5, the latter having a longitudilower part adapting the knuckle to receive the quadrant E through it in sliding engagement therein. The knee is formed to allow a forward and backward movement of the knuckle on the axis of its said pivot-pin and on the quadrant within a radius of about ninety degrees. The dog-bar C is pivoted within the lower socket 8, Fig. 5, of the knuckle by means of the pivot-pin 9, formed to fit the eye 10 of the knuckle and an eye at the lower end of the dogbar. The dog-bar has a dog 11 of suitable form and dimensions provided with means to raise and lower the same upon the bar to adapt the dog to engage logs of different sizes. D is pivoted within the upper socket 12 of the knuckle, Fig. 5, by means of the pivotpin 13, Figs. 3 and 1, formed to fit the eye 14, Fig. 5, of the knuckle and an eye at the toe of the lever. Near the center of the lower end of the lever it is formed with an elliptical vertical opening 15, Fig. 4, adapted to receive a round stoppin, which in turn is fixedly secured at either end thereof in the openings 16 16, Figs. 4, 5, in opposite sides of the upper socket of the knuckle. The heel 17, Fig. 4, of the lever is formed to adapt it to laterally engage the inner rear side of the upper socket 12 of the knuckle above the quadrant. The lever is also formed with a socket 19 near its The lever heel adapted to receive within it in vertical position the locking-pawl 20, which is secured in position within the same by means of the coil spring 21 and the stop-pin 22. The quadrant E is secured at its respective ends to the upper and lower arms of the knee A, Fig. 1, and is adapted to receive the knuckle B in sliding engagement through an opening in the upper socket of the latter. The quadrant is also provided with suitable teeth adapted to receive and engage the lockingpawl 20. The knuckle A is formed so that when the upper part of the knee engages it at the point 90, Fig. 4, the lever D cannot pass beyond a vertical position. The knee is also provided with a stop-hook F, Figs. 1, 2, fiX- edly secured to its upper arm and adapted to engage and lock the dog-barCwhen it reaches an angle of about thirty degrees in its backward movement.

Referring particularly to Fig. 1, it will be seen that when the log G is placed near the carriage to which my device is attached ready for operation the lever D stands vertically in the position there shown, and the dog-bar is in the position indicated by a, held there by the fulcrum stop hook F. Upon moving the lever D backward partly its heel engages the rear of the upper jaw of the knuckle as the weight, its fulcrum being the pivot-pin 13. This produces a secondary lever movement of the dog-bar, which then fulcrums on the stop-hook, and its lower end being drawn by the power from the hand-la ver transmitted through the knuckle below and outwardly with reference to the end of its heel to be raised the stop-hook throws the upper end of the dog-bar forward, so that the dog engages the log, as seen in the dotted-line position (1 If the lever D be moved to its limit backward, the dog-bar is thrown by a similar leverage movement forward, so that the dog engages and-hooks the log, as seen in the dotted-line position a It will be further seen that the locking-pawl 20 when moved backward automatically engages the teeth of the quadrant by means of the coil-spring forcing it outwardly to thelimit of the stop-pin 22, and the lever and dog-bar may thus be secured in any position within their radial limit, so that the dog will hold the log in the position desired or disengage a slab therefrom. In releasing the dog the elliptical opening 15 in the lever and the pivoting of same at its toe permits high enough above the end of the pawl as limited by its stop-pin to automatically disengage the pawl from the teeth of the quadrant, and thus allow the lever to be moved again to vertical position and the dog-bar to be thrown back to its position, as in a. v

My device thus provides a simple, automatic, reliable, and speedy means for automatically locking and releasing the lever which controls a log-dog. It also has a knuckle guided by a fixedly-secured quadrant, and this knuckle is provided with strong jaws which secure the lever and dog-bar in such a manner as to prevent vibratory and slack lateral movement of the same, while a stop hook prevents the dog-bar from being violently thrown back, all of which cunstruction and mechanical principles employed will be easily understood by those skilled in the art as distinguishing my invention from all those previously put forth designed to accomplish similar objects.

I olaimv 1. In a sawmill-dog mechanism on a sliding knee of a movable carriage, a combination comprising a dog-bar pivotally mounted at its foot at a suitable height in the lower socket or pair of jaws of a knuckle B and carrying a dog provided with means to secure and adjust the same thereon; an operatinglever D pivotally mounted at its toe in the upper socket or pair of jaws of the knuckle B, adapted to engage the socket with its heel and be guided over a toothed quadrant-bar in sliding engagement, also provided with means at its lower end to automatically lock the lever on or release it from the teeth of the quadrant; a knuckle B, at its lower end, pivotally mounted on the knee A and provided with upper and lower sockets or pairs of jaws, with an opening in the upper socket adapting it to be received and guided on the quadrantbar and having perforations in each socket and the lower end for pivots; a toothed quad- 1 at its foot at a suitable height in the lower socket or pair of jaws of a knuckle B and carrying a dog provided with means to secure and adjust the same thereon; an operatinglever D pivotally mounted at its toe in the upper socket or pair of aws of the knuckle B, adapted to engage the socket with its heel and be guided over a toothed quadrant-bar in sliding engagement, also provided with means at its lower end to automatically lock the lever on or release it from the teeth of the quadrant; a knuckle B, at its lower end, ivotally mounted on the knee A and provided with upper and lower sockets or pairs of jaws, with an opening in the upper socket adapting it to be received and guided on the quadrantbar and having perforations in each socket and the lower end for pivots; a toothed quadrant bar adapted to receive the knuckle through an opening in its upper socket; all substantially as described.

3. A sawmill-dog mechanism having a dog- I b'ar pivotally mounted at its foot at a suitable height in the lower socket of a knuckle B and carrying a dog provided with means to secure and adjust the same thereon, an operatinglever D pivotally mounted at its toe in the upper socket of the knuckle B adapted to engage the socket withits heel and having means in the lower end to automatically lock it on or release it from the toothed quadrant E, also the knuckle-mounting B provided with an upper lever-socket and lower dog-bar socket, each perforated as also the lower end for pivots thereof, the upper socket having an opening to receive the knuckle thereon, also the toothed quadrantbarE adapted to receive the knuckle as stated and a dog-bar fulcrum and stop-hook Ffixedly secured to a knee A, all substantially as described.

4. In a sawmill dogging mechanism, a knuckle-mounting for the lever and dog-bar, having a pivot-mounting at its lower end, a lower socket or pair of jaws for the dog-bar, an upper socket or pair of jaws for the operating-lever, each perforated for the pivots thereof and the upper socket provided with an opening for the knuckle to receive and be guided on a quadrant-bar, substantially as described.

CHARLES W. WILLETT. Witnesses:

H. J. KILEEMANN, F. A. NEEP.

quadrant-bar and guide the 

